Snark. Very responsive, accurate. Display can be a little hard to read under bright lights, especially if you're not looking straight on. Has a little pinhole mic on it that you might want to cover with electrical tape to lessen the effects of extraneous sounds.

Snarks are pretty good. It sometimes has a hard time tracking the A and E strings on my basses. I'll have to try some different places on the headstock. Using the 12th fret harmonic instead of the open string works if it's having trouble on the lower strings.

Another vote for the Snark. I have the Snark SN-5 and SN8, as well as the Planet Waves NS mini, and the Intellitouch PT-10.

The Snark SN-5 (Black with White Writing/Silver Button) and SN-8 (Black with Yellow Writing/Yellow Button). The 8 is a bit faster, and is more sensitive and seems to be the one that works best for bass in my opinion. They are my preferred headstock tuners. The downside is they are pretty large. Oh and as far as the mic, the SN-2 is the only one with the mic. Another bonus to the Snarks, is that some even have a built in tap tempo metronome.

The Intellitouch PT-10, it doesn't work that well for any of my basses.... works great for my guitars though. I also have the Planet Waves NS Mini, and it works pretty well but it can be kinda hard to see since it's so small.... and on tilt back headstocks sometimes it's hard to find a good place to put it. The nice thing is it's so tiny you can leave it on there and you'll never notice.

I have a Snark SN8. It works well but gives me a little bit of an issue with the B string. It's acts like the note dies off, or something. I can get the string in tune, but I have to use the 5th or 12th fret harmonic and pluck it more often than the other strings. I suppose it's good for the price and convenience.

I ignored clip on tuners until one cold morning I tuned up my bass at church and then heard it go flat on me during the first service as the place warmed up. I am sure that a pedal would work great too but I don't use pedals so a clip on was less of a change to my routine, it stays on the bass all the time. I started with a Planet Waves NS Mini because I thought unobtrusive would be the way to go. The girl behind the counter at GC tried to talk me into a Snark because she liked the display better but I went with the PW. It is a great little tuner, all I need really. I liked it well enough to get a couple more for my other basses but this time I went to a local music store and all they had were Snarks so I went with those. By then I had concluded that their larger size wasn't really an issue since no one notices the bass player at church, much less what he has clipped to his headstock. And I have to say the Snark display is nicer, the girl at GC knew what she was talking about.

Both kinds work well. My lowest string is tuned to C instead of B and either tuner picks it up pretty well. Sometimes there is a bit of a delay on the low string. The other strings respond faster yet it will often latch on to harmonics (I guess) because the A string, for example, will often intermittently be reported as an off pitch E. I have less issues with this sort of thing when I use tuners that plug into the output jack and read the signal electrically. The clip on tuners do work well though. You can tune up quickly in spite of the reading issues and if you don't want to use pedals they cannot be beat for convenience.

I like the Snark too, but it's the only one I've had extensive experience with. I helped my old boss at his store a little last year, so I got to play around a bit with several. I bought a Snark because it worked well and was inexpensive. Reasonably rugged if you take normal care of it.

As for using open strings versus harmonics (and this applies to any tuner)- The octave harmonics (5th and 12th fret) ARE exact octaves if your strings are in good shape, and if your strings aren't in good shape then intonation is out no matter what you do. So, using harmonics is NOT in any way a problem- if the harmonic is in tune and your strings are in good shape, the open string is in tune exactly the same.

And, I'd say that the harmonic, because it's a higher frequency, gives the tuner a better sampling rate to get an accurate count of the vibrations- so in fact the harmonic probably works better for any tuner that's counting frequencies.

I like my planet waves headstock tuner, it's small and only I can see it, I think the snark is the most accurate out right now, but they look super goofy IMO. I just tune by using the 12th fret harmonics, never had an issue. The planet waves is cheap too. I hope this helps.

I've had 4 different Snarks, the ukulele one, the chromatic one, and two other ones. They're all equally accurate for basses, in my experience. I always chuckle when I see them in Sam Ash or GC for 30 bucks when they're 10-12 bucks on the interwebs.

I think the Snarks are faster and more accurate than the Planet Waves mini, but they don't travel as well. They need room around them; if pressure is put on the 'arm', the socket holding the arm breaks pretty easily.

i use the GoGo TT-1 clip on tuner and it is fast, accurate, and extremely easy to see in any lighting. it handles the low B with no problems. it has shown to be very durable and has a switch to use the built in mic or only thru the vibrations. it is more expensive than the snark but in my opinion i believe it is worth it.

I had a clip on fender brand one and it worked great. Tracked very well. A buddy has a Snark that I have used, and it also worked very well. I think clip on tuners have come a long way, really just in the last year or two. I love them for practice, and around the house.

As for the bad side... EASY TO LOOSE. I lost mine at a gig this past Sunday. I don't like to keep it clipped on to the bass. I tune once, and tune at the set break, or when I need to tune. Back to the old Boss pedal tuner for me.